opacity.html - mozsearch

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This test has a WPT meta file that expects 4 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /web-animations/responsive/opacity.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<div id='container'>

    <div id='element'></div>

</div>

<script>

'use strict';

var container = document.getElementById('container');

var element = document.getElementById('element');

var properties = [

    'fillOpacity',

    'floodOpacity',

    'opacity',

    'shapeImageThreshold',

    'stopOpacity',

    'strokeOpacity',

];

for (var property of properties) {

    test(function() {

        var initialKeyframe = {};

        initialKeyframe[property] = 'inherit';

        var finalKeyframe = {};

        finalKeyframe[property] = '0.5';

        var keyframes = [ initialKeyframe, finalKeyframe ];

        container.style[property] = 1;

        var player = element.animate(keyframes, 10);

        player.pause();

        player.currentTime = 5;

        assert_equals(getComputedStyle(element)[property], '0.75');

        container.style[property] = 0.25;

        assert_equals(getComputedStyle(element)[property], '0.375');

        container.style[property] = -0.5; // clamps to 0

        assert_equals(getComputedStyle(element)[property], '0.25');

        container.style[property] = 2; // clamps to 1

        assert_equals(getComputedStyle(element)[property], '0.75');

    }, property + ' responsive to inherited changes');

</script>